Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2005-11-01
2005-11-01
Snider, Theresa T. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S340300, C015S348000, C015S349000
Reexamination Certificate
active
06959466
ABSTRACT:
A power management system for a surface maintenance machine, such as a street sweeper is disclosed. The system includes a variable speed engine for transporting the surface maintenance machine, a hydraulic pump powered by the engine, a vacuum fan motor powered by the hydraulic pump, an engine speed sensor coupled to the engine, an electric proportional valve coupled between the hydraulic pump and the vacuum fan motor, said valve for selectively restricting a flow rate to the vacuum fan motor, and a control unit operatively coupled to the engine speed sensor and the proportional valve, said control unit receiving engine speed information from the engine speed sensor and communicating a predetermined signal to the proportional valve to control the flow rate to the vacuum fan motor as a function of engine speed. A method of managing engine power from a single-engine street sweeper is also disclosed.
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Alowonle Musibau O.
Block Craig D.
Erko Robert J.
Milun Richard F.
Fulbright & Jaworski L.L.P.
Snider Theresa T.
Tennant Company
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